<template>
    <div class="todo-header">
        <input type="text"
               placeholder="请输入你的任务名称，按回车键确认"
               v-model="title"
               @keyup.enter="addItem"/>
    </div>
</template>

<script>
    export default {
        name: "TodoHeader",
        data() {
            return {
                title: ''
            }
        },
        methods: {
            addItem() {
                const title = this.title;
                if (!title) {
                    alert("Parameter Error");
                    return;
                }
                const todo = {
                    title,
                    status: false
                };
                // 触发自定义事件
                this.$emit('addTodo', todo);
                this.title = '';
            }
        }
    }
</script>

<style scoped>
    .todo-header input {
        width: 560px;
        height: 28px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
    }
    .todo-header input:focus {
        outline: none;
        border-color: rgba(82, 168, 236, 0.8);
        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
    }
</style>